2020 GMC Sierra 3500 Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

9 Alternator / Generator parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, FVP, PURE ENERGY and 2 other brands. GM GENUINE 13563313 carries the "Popular" badge. 6 parts fit every engine; the other 3 are engine-specific.

In the New grade, GM GENUINE and WAI GLOBAL supply 4 parts: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 13563313.

In the Remanufactured grade, FVP, PURE ENERGY and TERREPOWER supply 5 parts: factory-rebuilt units with new wear components. A representative part number is FVP 10394.

Part numbers include GM GENUINE 13563313, GM GENUINE 13563314 and GM GENUINE 85671415, among others listed above.

This table covers the Alternator / Generator bolts. Read more

This group shows a single part: GM GENUINE 11611384.

This table covers the brackets that mount the Alternator / Generator. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 97356246.

This table covers the Alternator / Generator bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500.

This group includes GM GENUINE 12624586 and GM GENUINE 12623219.

This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

3 Alternator / Generator Pulley parts for the 2020 GMC Sierra 3500 come from 2 brands — LITENS and CONTINENTAL. Every part fits both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged.

Part numbers include CONTINENTAL 49903, LITENS 920112A and LITENS 920111A.

This table covers the Anti-Theft control modules. Read more

2 Anti-Theft Control Module parts for the 2020 GMC Sierra 3500 come from GM GENUINE. Every part fits both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged.

This group includes GM GENUINE 13516351 and GM GENUINE 13516352.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

21 Battery parts for the 2020 GMC Sierra 3500 come from 8 brands — FVP, DEKA, LUCAS and 5 other brands. The "Popular" part is DEKA 9A48.

In the AGM (Extended Life) grade, DEKA, LUCAS, ACDELCO and 4 other brands supply 13 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A48.

In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 1 part: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT85094R.

7 further parts sit outside the graded sections, with the same engine-level match.

This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early. Read more

GM GENUINE supplies the 7 Battery Cable parts for the 2020 GMC Sierra 3500. GM GENUINE 84794790 carries the "Popular" badge. 3 parts fit every engine; the other 4 are engine-specific.

This group includes GM GENUINE 84794790, GM GENUINE 87866332 and GM GENUINE 84772924 and the remaining parts above.

This table covers the Battery Cable Terminal ends. Read more

This group shows a single part: GM GENUINE 84335255.

This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Battery Current Sensor parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and STANDARD MOTOR PRODUCTS. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include GM GENUINE 13505369 and STANDARD MOTOR PRODUCTS SBC111.

This table covers the Battery Terminal Bolt nuts. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 11570961.

This table covers the Blind Spot Detection sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

HELLA supplies both parts for the 2020 GMC Sierra 3500. All of them fit every engine offered in the 2020 Sierra 3500.

Listed part numbers: HELLA 013068241 and HELLA 013068041.

This table covers the body-control modules that run lighting, locks and wipers. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500. All of them fit every engine offered in the 2020 Sierra 3500.

This group includes GM GENUINE 13529041 and GM GENUINE 84652297.

This table covers the resettable circuit breakers in this vehicle's electrical system. Read more

3 Circuit Breaker parts for the 2020 GMC Sierra 3500 come from 2 brands — STANDARD MOTOR PRODUCTS and BUSSMANN. Every part fits both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged.

Listed part numbers: BUSSMANN CB22115, STANDARD MOTOR PRODUCTS FH58 and STANDARD MOTOR PRODUCTS FH59.

This table covers the engine-control modules that run fuel, spark and emissions. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500.

Part numbers include GM GENUINE 12725133 and GM GENUINE 12720006.

This table covers the brackets that mount the Engine Control Module (ECM Computer). Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 87814257.

This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse. Read more

71 Fuse parts for the 2020 GMC Sierra 3500 come from 3 brands — BUSSMANN, GM GENUINE and ACDELCO. The "Popular" part is BUSSMANN ATM10. 10 Amp, 100 Amp, 125 Amp, 15 Amp, 150 Amp, 175 Amp, 2 Amp, 20 Amp, 225 Amp, 25 Amp, 250 Amp, 3 Amp, 30 Amp, 300 Amp, 350 Amp, 4 Amp, 40 Amp, 400 Amp, 450 Amp, 5 Amp, 50 Amp, 60 Amp, 7.5 Amp, 70 Amp and 80 Amp are all represented, and 15 Amp alone accounts for 8 parts.

This table covers the fuse blocks that hold this vehicle's fuses. Read more

DORMAN supplies both parts for the 2020 GMC Sierra 3500.

This group includes DORMAN 956120 and DORMAN 956122.

This table covers the horns mounted in the front of the vehicle. Read more

This group shows a single part: GM GENUINE 84716742.

This table covers the Jumper cables. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early. Read more

GM GENUINE supplies the 4 Jumper Cable parts for the 2020 GMC Sierra 3500.

This group includes GM GENUINE 84655050, GM GENUINE 84655061 and GM GENUINE 84655051 and the remaining parts above.

This table covers the receivers that pick up the key-fob unlock signal. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500. All of them fit every engine offered in the 2020 Sierra 3500.

This group includes GM GENUINE 13523298 and GM GENUINE 13558725.

This table covers the key fobs that lock, unlock and start the vehicle. Read more

8 Keyless Entry Remote parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and DORMAN. GM GENUINE 22881479 carries the "Popular" badge. All of them fit every engine offered in the 2020 Sierra 3500.

Listed part numbers: GM GENUINE 22881479, GM GENUINE 84209236 and DORMAN 99444ST, plus the other parts above.

This table covers the replacement shells for the key fob. Read more

One part is listed for the 2020 GMC Sierra 3500 — DORMAN 95642.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

4 Parking Aid Sensor parts are listed for the 2020 GMC Sierra 3500, from BOSCH, GM GENUINE, STANDARD MOTOR PRODUCTS and 1 other brand. All of them fit every engine offered in the 2020 Sierra 3500.

Part numbers include BOSCH F00E270754, GM GENUINE 86524820 and STANDARD MOTOR PRODUCTS PPS159, among others listed above.

This table covers the brackets that mount the Parking Aid Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

12 Parking Aid Sensor Bracket parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, TECHPRO and VARIOUS MFR. GM GENUINE 84695397 carries the "Popular" badge.

This table covers the totally-integrated power modules that distribute body electrical power. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

2 Power Supply Module (TIPM) parts for the 2020 GMC Sierra 3500 come from GM GENUINE.

This group includes GM GENUINE 84379747 and GM GENUINE 84601806.

This table covers the Power Take Off (PTO) control modules. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 84741097.

This table covers the Serial Data Gateway modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 13534928.

This table covers the Side Object Sensor modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500.

This group includes GM GENUINE 84729106 and GM GENUINE 84729107.

This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor. Read more

6 Speed Sensor parts for the 2020 GMC Sierra 3500 come from 3 brands — STANDARD MOTOR PRODUCTS, DELPHI and GM GENUINE. The "Popular" part is DELPHI SS12245.

Listed part numbers: DELPHI SS12245, GM GENUINE 24284707 and STANDARD MOTOR PRODUCTS SC835, plus the other parts above.

This table covers the Starter bolts. Read more

3 Starter Bolt parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE and DORMAN.

Listed part numbers: DORMAN 72004, GM GENUINE 97329632 and GM GENUINE 11610633.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

7 Starter Motor parts are listed for the 2020 GMC Sierra 3500, from GM GENUINE, TYC, WAI GLOBAL and 4 other brands. GM GENUINE 12740951 carries the "Popular" badge.

New: 3 parts, from GM GENUINE, TYC and WAI GLOBAL. A representative part number is GM GENUINE 12740951.

Remanufactured: 4 parts, from FVP, PURE ENERGY, REMY and 1 other brand. A representative part number is FVP 12817.

Listed part numbers: GM GENUINE 12740951, TYC 116029 and WAI GLOBAL 16029N, plus the other parts above.

This table covers the Video control modules. Read more

GM GENUINE supplies both parts for the 2020 GMC Sierra 3500.

Listed part numbers: GM GENUINE 84784629 and GM GENUINE 84833405.

This table covers the Wiring Harness clips. Read more

One part is listed for the 2020 GMC Sierra 3500 — GM GENUINE 12337820.